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Finding the Fourth Proportional to 652,807.70, 979,211.55 and 428,858.90

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Solution

The fourth proportional to 652,807.70, 979,211.55 and 428,858.90 is: 643,288.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    652,807.70 : 979,211.55 = 428,858.90 : x
  2. Step 2: Convert to fraction form
    652,807.70/979,211.55 = 428,858.90/x
  3. Step 3: Cross multiply
    652,807.70x = 979,211.55 × 428,858.90
  4. Step 4: Simplify right side
    652,807.70x = 419,943,588,200.30
  5. Step 5: Solve for x
    x = 419,943,588,200.30/652,807.70
  6. Step 6: Final answer
    x = 643,288.35

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.