Home / 100,649.40-138,927.08-64,839.28

Finding the Fourth Proportional to 100,649.40, 138,927.08 and 64,839.28

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Solution

The fourth proportional to 100,649.40, 138,927.08 and 64,839.28 is: 89,498.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,649.40 : 138,927.08 = 64,839.28 : x
  2. Step 2: Convert to fraction form
    100,649.40/138,927.08 = 64,839.28/x
  3. Step 3: Cross multiply
    100,649.40x = 138,927.08 × 64,839.28
  4. Step 4: Simplify right side
    100,649.40x = 9,007,931,839.70
  5. Step 5: Solve for x
    x = 9,007,931,839.70/100,649.40
  6. Step 6: Final answer
    x = 89,498.12

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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.