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Finding the Fourth Proportional to 100,348.96, 138,368.05 and 64,001.79

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Solution

The fourth proportional to 100,348.96, 138,368.05 and 64,001.79 is: 88,250.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,348.96 : 138,368.05 = 64,001.79 : x
  2. Step 2: Convert to fraction form
    100,348.96/138,368.05 = 64,001.79/x
  3. Step 3: Cross multiply
    100,348.96x = 138,368.05 × 64,001.79
  4. Step 4: Simplify right side
    100,348.96x = 8,855,802,878.81
  5. Step 5: Solve for x
    x = 8,855,802,878.81/100,348.96
  6. Step 6: Final answer
    x = 88,250.07

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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.