Home / 100,320.72-138,455.64-65,895.18

Finding the Fourth Proportional to 100,320.72, 138,455.64 and 65,895.18

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Solution

The fourth proportional to 100,320.72, 138,455.64 and 65,895.18 is: 90,943.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,320.72 : 138,455.64 = 65,895.18 : x
  2. Step 2: Convert to fraction form
    100,320.72/138,455.64 = 65,895.18/x
  3. Step 3: Cross multiply
    100,320.72x = 138,455.64 × 65,895.18
  4. Step 4: Simplify right side
    100,320.72x = 9,123,559,319.82
  5. Step 5: Solve for x
    x = 9,123,559,319.82/100,320.72
  6. Step 6: Final answer
    x = 90,943.92

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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.