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Finding the Fourth Proportional to 579,813.40, 869,720.10 and 390,856.60

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Solution

The fourth proportional to 579,813.40, 869,720.10 and 390,856.60 is: 586,284.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,813.40 : 869,720.10 = 390,856.60 : x
  2. Step 2: Convert to fraction form
    579,813.40/869,720.10 = 390,856.60/x
  3. Step 3: Cross multiply
    579,813.40x = 869,720.10 × 390,856.60
  4. Step 4: Simplify right side
    579,813.40x = 339,935,841,237.66
  5. Step 5: Solve for x
    x = 339,935,841,237.66/579,813.40
  6. Step 6: Final answer
    x = 586,284.90

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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.