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Finding the Fourth Proportional to 78,677.42, 108,575.44 and 42,868.40

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Solution

The fourth proportional to 78,677.42, 108,575.44 and 42,868.40 is: 59,158.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,677.42 : 108,575.44 = 42,868.40 : x
  2. Step 2: Convert to fraction form
    78,677.42/108,575.44 = 42,868.40/x
  3. Step 3: Cross multiply
    78,677.42x = 108,575.44 × 42,868.40
  4. Step 4: Simplify right side
    78,677.42x = 4,654,455,392.10
  5. Step 5: Solve for x
    x = 4,654,455,392.10/78,677.42
  6. Step 6: Final answer
    x = 59,158.72

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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.