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Finding the Fourth Proportional to 128,460.80, 192,561.60 and 58,390.40

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Solution

The fourth proportional to 128,460.80, 192,561.60 and 58,390.40 is: 87,526.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,460.80 : 192,561.60 = 58,390.40 : x
  2. Step 2: Convert to fraction form
    128,460.80/192,561.60 = 58,390.40/x
  3. Step 3: Cross multiply
    128,460.80x = 192,561.60 × 58,390.40
  4. Step 4: Simplify right side
    128,460.80x = 11,243,748,848.64
  5. Step 5: Solve for x
    x = 11,243,748,848.64/128,460.80
  6. Step 6: Final answer
    x = 87,526.69

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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.