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Finding the Fourth Proportional to 128,045.90, 192,068.85 and 72,058.70

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Solution

The fourth proportional to 128,045.90, 192,068.85 and 72,058.70 is: 108,088.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,045.90 : 192,068.85 = 72,058.70 : x
  2. Step 2: Convert to fraction form
    128,045.90/192,068.85 = 72,058.70/x
  3. Step 3: Cross multiply
    128,045.90x = 192,068.85 × 72,058.70
  4. Step 4: Simplify right side
    128,045.90x = 13,840,231,641.50
  5. Step 5: Solve for x
    x = 13,840,231,641.50/128,045.90
  6. Step 6: Final answer
    x = 108,088.05

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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.