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Finding the Fourth Proportional to 138,590.52, 191,284.59 and 87,570.86

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Solution

The fourth proportional to 138,590.52, 191,284.59 and 87,570.86 is: 120,866.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,590.52 : 191,284.59 = 87,570.86 : x
  2. Step 2: Convert to fraction form
    138,590.52/191,284.59 = 87,570.86/x
  3. Step 3: Cross multiply
    138,590.52x = 191,284.59 × 87,570.86
  4. Step 4: Simplify right side
    138,590.52x = 16,750,955,094.62
  5. Step 5: Solve for x
    x = 16,750,955,094.62/138,590.52
  6. Step 6: Final answer
    x = 120,866.53

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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.