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Finding the Fourth Proportional to 643,489.76, 887,973.36 and 357,000.32

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Solution

The fourth proportional to 643,489.76, 887,973.36 and 357,000.32 is: 492,636.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,489.76 : 887,973.36 = 357,000.32 : x
  2. Step 2: Convert to fraction form
    643,489.76/887,973.36 = 357,000.32/x
  3. Step 3: Cross multiply
    643,489.76x = 887,973.36 × 357,000.32
  4. Step 4: Simplify right side
    643,489.76x = 317,006,773,671.48
  5. Step 5: Solve for x
    x = 317,006,773,671.48/643,489.76
  6. Step 6: Final answer
    x = 492,636.86

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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.