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Finding the Fourth Proportional to 128,842.16, 177,803.64 and 71,482.55

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Solution

The fourth proportional to 128,842.16, 177,803.64 and 71,482.55 is: 98,646.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,842.16 : 177,803.64 = 71,482.55 : x
  2. Step 2: Convert to fraction form
    128,842.16/177,803.64 = 71,482.55/x
  3. Step 3: Cross multiply
    128,842.16x = 177,803.64 × 71,482.55
  4. Step 4: Simplify right side
    128,842.16x = 12,709,856,697.46
  5. Step 5: Solve for x
    x = 12,709,856,697.46/128,842.16
  6. Step 6: Final answer
    x = 98,646.73

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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.