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Finding the Fourth Proportional to 659,265.76, 909,935.28 and 387,421

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Solution

The fourth proportional to 659,265.76, 909,935.28 and 387,421 is: 534,728.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,265.76 : 909,935.28 = 387,421 : x
  2. Step 2: Convert to fraction form
    659,265.76/909,935.28 = 387,421/x
  3. Step 3: Cross multiply
    659,265.76x = 909,935.28 × 387,421
  4. Step 4: Simplify right side
    659,265.76x = 352,528,036,112.88
  5. Step 5: Solve for x
    x = 352,528,036,112.88/659,265.76
  6. Step 6: Final answer
    x = 534,728.27

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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.