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Finding the Fourth Proportional to 71,521.79, 98,700.12 and 39,690.71

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Solution

The fourth proportional to 71,521.79, 98,700.12 and 39,690.71 is: 54,773.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,521.79 : 98,700.12 = 39,690.71 : x
  2. Step 2: Convert to fraction form
    71,521.79/98,700.12 = 39,690.71/x
  3. Step 3: Cross multiply
    71,521.79x = 98,700.12 × 39,690.71
  4. Step 4: Simplify right side
    71,521.79x = 3,917,477,716.51
  5. Step 5: Solve for x
    x = 3,917,477,716.51/71,521.79
  6. Step 6: Final answer
    x = 54,773.21

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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.