Home / 128,689.56-177,598.86-72,119.16

Finding the Fourth Proportional to 128,689.56, 177,598.86 and 72,119.16

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Solution

The fourth proportional to 128,689.56, 177,598.86 and 72,119.16 is: 99,528.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,689.56 : 177,598.86 = 72,119.16 : x
  2. Step 2: Convert to fraction form
    128,689.56/177,598.86 = 72,119.16/x
  3. Step 3: Cross multiply
    128,689.56x = 177,598.86 × 72,119.16
  4. Step 4: Simplify right side
    128,689.56x = 12,808,280,600.16
  5. Step 5: Solve for x
    x = 12,808,280,600.16/128,689.56
  6. Step 6: Final answer
    x = 99,528.51

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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.