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Finding the Fourth Proportional to 665,052.68, 917,443.85 and 392,988.93

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Solution

The fourth proportional to 665,052.68, 917,443.85 and 392,988.93 is: 542,130.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,052.68 : 917,443.85 = 392,988.93 : x
  2. Step 2: Convert to fraction form
    665,052.68/917,443.85 = 392,988.93/x
  3. Step 3: Cross multiply
    665,052.68x = 917,443.85 × 392,988.93
  4. Step 4: Simplify right side
    665,052.68x = 360,545,274,981.64
  5. Step 5: Solve for x
    x = 360,545,274,981.64/665,052.68
  6. Step 6: Final answer
    x = 542,130.40

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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.