Home / 100,113.89-138,129.85-58,720.66

Finding the Fourth Proportional to 100,113.89, 138,129.85 and 58,720.66

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Solution

The fourth proportional to 100,113.89, 138,129.85 and 58,720.66 is: 81,018.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,113.89 : 138,129.85 = 58,720.66 : x
  2. Step 2: Convert to fraction form
    100,113.89/138,129.85 = 58,720.66/x
  3. Step 3: Cross multiply
    100,113.89x = 138,129.85 × 58,720.66
  4. Step 4: Simplify right side
    100,113.89x = 8,111,075,957.70
  5. Step 5: Solve for x
    x = 8,111,075,957.70/100,113.89
  6. Step 6: Final answer
    x = 81,018.49

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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.