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Finding the Fourth Proportional to 85,512.90, 117,931.14 and 71,220.18

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Solution

The fourth proportional to 85,512.90, 117,931.14 and 71,220.18 is: 98,220.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,512.90 : 117,931.14 = 71,220.18 : x
  2. Step 2: Convert to fraction form
    85,512.90/117,931.14 = 71,220.18/x
  3. Step 3: Cross multiply
    85,512.90x = 117,931.14 × 71,220.18
  4. Step 4: Simplify right side
    85,512.90x = 8,399,077,018.41
  5. Step 5: Solve for x
    x = 8,399,077,018.41/85,512.90
  6. Step 6: Final answer
    x = 98,220.00

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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.