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Finding the Fourth Proportional to 128,271.70, 192,407.55 and 86,281.30

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Solution

The fourth proportional to 128,271.70, 192,407.55 and 86,281.30 is: 129,421.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,271.70 : 192,407.55 = 86,281.30 : x
  2. Step 2: Convert to fraction form
    128,271.70/192,407.55 = 86,281.30/x
  3. Step 3: Cross multiply
    128,271.70x = 192,407.55 × 86,281.30
  4. Step 4: Simplify right side
    128,271.70x = 16,601,173,543.82
  5. Step 5: Solve for x
    x = 16,601,173,543.82/128,271.70
  6. Step 6: Final answer
    x = 129,421.95

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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.