Home / 90,721.40-136,082.10-69,985.40

Finding the Fourth Proportional to 90,721.40, 136,082.10 and 69,985.40

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Solution

The fourth proportional to 90,721.40, 136,082.10 and 69,985.40 is: 104,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,721.40 : 136,082.10 = 69,985.40 : x
  2. Step 2: Convert to fraction form
    90,721.40/136,082.10 = 69,985.40/x
  3. Step 3: Cross multiply
    90,721.40x = 136,082.10 × 69,985.40
  4. Step 4: Simplify right side
    90,721.40x = 9,523,760,201.34
  5. Step 5: Solve for x
    x = 9,523,760,201.34/90,721.40
  6. Step 6: Final answer
    x = 104,978.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.