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Finding the Fourth Proportional to 655,128.61, 904,569.93 and 644,665.84

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Solution

The fourth proportional to 655,128.61, 904,569.93 and 644,665.84 is: 890,123.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    655,128.61 : 904,569.93 = 644,665.84 : x
  2. Step 2: Convert to fraction form
    655,128.61/904,569.93 = 644,665.84/x
  3. Step 3: Cross multiply
    655,128.61x = 904,569.93 × 644,665.84
  4. Step 4: Simplify right side
    655,128.61x = 583,145,331,500.77
  5. Step 5: Solve for x
    x = 583,145,331,500.77/655,128.61
  6. Step 6: Final answer
    x = 890,123.44

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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.