Home / 128,868.16-177,828.96-71,510.40

Finding the Fourth Proportional to 128,868.16, 177,828.96 and 71,510.40

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Solution

The fourth proportional to 128,868.16, 177,828.96 and 71,510.40 is: 98,679.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,868.16 : 177,828.96 = 71,510.40 : x
  2. Step 2: Convert to fraction form
    128,868.16/177,828.96 = 71,510.40/x
  3. Step 3: Cross multiply
    128,868.16x = 177,828.96 × 71,510.40
  4. Step 4: Simplify right side
    128,868.16x = 12,716,620,061.18
  5. Step 5: Solve for x
    x = 12,716,620,061.18/128,868.16
  6. Step 6: Final answer
    x = 98,679.30

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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.