Home / 128,312.40-177,071.28-71,723.68

Finding the Fourth Proportional to 128,312.40, 177,071.28 and 71,723.68

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Solution

The fourth proportional to 128,312.40, 177,071.28 and 71,723.68 is: 98,978.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,312.40 : 177,071.28 = 71,723.68 : x
  2. Step 2: Convert to fraction form
    128,312.40/177,071.28 = 71,723.68/x
  3. Step 3: Cross multiply
    128,312.40x = 177,071.28 × 71,723.68
  4. Step 4: Simplify right side
    128,312.40x = 12,700,203,823.91
  5. Step 5: Solve for x
    x = 12,700,203,823.91/128,312.40
  6. Step 6: Final answer
    x = 98,978.77

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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.