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Finding the Fourth Proportional to 42,998.60, 64,468.46 and 21,897.80

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Solution

The fourth proportional to 42,998.60, 64,468.46 and 21,897.80 is: 32,831.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,998.60 : 64,468.46 = 21,897.80 : x
  2. Step 2: Convert to fraction form
    42,998.60/64,468.46 = 21,897.80/x
  3. Step 3: Cross multiply
    42,998.60x = 64,468.46 × 21,897.80
  4. Step 4: Simplify right side
    42,998.60x = 1,411,717,011.56
  5. Step 5: Solve for x
    x = 1,411,717,011.56/42,998.60
  6. Step 6: Final answer
    x = 32,831.70

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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.