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Finding the Fourth Proportional to 100,701.07, 138,897.21 and 85,488.86

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Solution

The fourth proportional to 100,701.07, 138,897.21 and 85,488.86 is: 117,914.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,701.07 : 138,897.21 = 85,488.86 : x
  2. Step 2: Convert to fraction form
    100,701.07/138,897.21 = 85,488.86/x
  3. Step 3: Cross multiply
    100,701.07x = 138,897.21 × 85,488.86
  4. Step 4: Simplify right side
    100,701.07x = 11,874,164,807.91
  5. Step 5: Solve for x
    x = 11,874,164,807.91/100,701.07
  6. Step 6: Final answer
    x = 117,914.98

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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.