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Finding the Fourth Proportional to 656,426.88, 986,419.20 and 357,128.64

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Solution

The fourth proportional to 656,426.88, 986,419.20 and 357,128.64 is: 536,660.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,426.88 : 986,419.20 = 357,128.64 : x
  2. Step 2: Convert to fraction form
    656,426.88/986,419.20 = 357,128.64/x
  3. Step 3: Cross multiply
    656,426.88x = 986,419.20 × 357,128.64
  4. Step 4: Simplify right side
    656,426.88x = 352,278,547,365.89
  5. Step 5: Solve for x
    x = 352,278,547,365.89/656,426.88
  6. Step 6: Final answer
    x = 536,660.76

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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.