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Finding the Fourth Proportional to 643,358.55, 887,941.28 and 356,970.90

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Solution

The fourth proportional to 643,358.55, 887,941.28 and 356,970.90 is: 492,678.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,358.55 : 887,941.28 = 356,970.90 : x
  2. Step 2: Convert to fraction form
    643,358.55/887,941.28 = 356,970.90/x
  3. Step 3: Cross multiply
    643,358.55x = 887,941.28 × 356,970.90
  4. Step 4: Simplify right side
    643,358.55x = 316,969,196,083.90
  5. Step 5: Solve for x
    x = 316,969,196,083.90/643,358.55
  6. Step 6: Final answer
    x = 492,678.92

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.