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Finding the Fourth Proportional to 78,672.77, 108,569.67 and 42,862.77

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Solution

The fourth proportional to 78,672.77, 108,569.67 and 42,862.77 is: 59,151.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,672.77 : 108,569.67 = 42,862.77 : x
  2. Step 2: Convert to fraction form
    78,672.77/108,569.67 = 42,862.77/x
  3. Step 3: Cross multiply
    78,672.77x = 108,569.67 × 42,862.77
  4. Step 4: Simplify right side
    78,672.77x = 4,653,596,633.45
  5. Step 5: Solve for x
    x = 4,653,596,633.45/78,672.77
  6. Step 6: Final answer
    x = 59,151.30

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1.5x scale

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.