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Finding the Fourth Proportional to 65,403.71, 98,085.45 and 21,018.55

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Solution

The fourth proportional to 65,403.71, 98,085.45 and 21,018.55 is: 31,521.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,403.71 : 98,085.45 = 21,018.55 : x
  2. Step 2: Convert to fraction form
    65,403.71/98,085.45 = 21,018.55/x
  3. Step 3: Cross multiply
    65,403.71x = 98,085.45 × 21,018.55
  4. Step 4: Simplify right side
    65,403.71x = 2,061,613,444.67
  5. Step 5: Solve for x
    x = 2,061,613,444.67/65,403.71
  6. Step 6: Final answer
    x = 31,521.35

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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.