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Finding the Fourth Proportional to 118,470, 163,488.20 and 64,755

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Solution

The fourth proportional to 118,470, 163,488.20 and 64,755 is: 89,361.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,470 : 163,488.20 = 64,755 : x
  2. Step 2: Convert to fraction form
    118,470/163,488.20 = 64,755/x
  3. Step 3: Cross multiply
    118,470x = 163,488.20 × 64,755
  4. Step 4: Simplify right side
    118,470x = 10,586,678,391
  5. Step 5: Solve for x
    x = 10,586,678,391/118,470
  6. Step 6: Final answer
    x = 89,361.68

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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.