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Finding the Fourth Proportional to 128,416.90, 192,625.35 and 97,312.90

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Solution

The fourth proportional to 128,416.90, 192,625.35 and 97,312.90 is: 145,969.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,416.90 : 192,625.35 = 97,312.90 : x
  2. Step 2: Convert to fraction form
    128,416.90/192,625.35 = 97,312.90/x
  3. Step 3: Cross multiply
    128,416.90x = 192,625.35 × 97,312.90
  4. Step 4: Simplify right side
    128,416.90x = 18,744,931,422.02
  5. Step 5: Solve for x
    x = 18,744,931,422.02/128,416.90
  6. Step 6: Final answer
    x = 145,969.35

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Similar ratio
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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.