Home / 78,102.18-107,780.45-42,291.36

Finding the Fourth Proportional to 78,102.18, 107,780.45 and 42,291.36

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Solution

The fourth proportional to 78,102.18, 107,780.45 and 42,291.36 is: 58,361.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,102.18 : 107,780.45 = 42,291.36 : x
  2. Step 2: Convert to fraction form
    78,102.18/107,780.45 = 42,291.36/x
  3. Step 3: Cross multiply
    78,102.18x = 107,780.45 × 42,291.36
  4. Step 4: Simplify right side
    78,102.18x = 4,558,181,600.46
  5. Step 5: Solve for x
    x = 4,558,181,600.46/78,102.18
  6. Step 6: Final answer
    x = 58,361.77

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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.