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Finding the Fourth Proportional to 518,783.28, 715,931.88 and 292,428.72

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Solution

The fourth proportional to 518,783.28, 715,931.88 and 292,428.72 is: 403,557.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,783.28 : 715,931.88 = 292,428.72 : x
  2. Step 2: Convert to fraction form
    518,783.28/715,931.88 = 292,428.72/x
  3. Step 3: Cross multiply
    518,783.28x = 715,931.88 × 292,428.72
  4. Step 4: Simplify right side
    518,783.28x = 209,359,043,275.59
  5. Step 5: Solve for x
    x = 209,359,043,275.59/518,783.28
  6. Step 6: Final answer
    x = 403,557.81

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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.