Home / 225,021.60-310,478.40-129,510.72

Finding the Fourth Proportional to 225,021.60, 310,478.40 and 129,510.72

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Solution

The fourth proportional to 225,021.60, 310,478.40 and 129,510.72 is: 178,695.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,021.60 : 310,478.40 = 129,510.72 : x
  2. Step 2: Convert to fraction form
    225,021.60/310,478.40 = 129,510.72/x
  3. Step 3: Cross multiply
    225,021.60x = 310,478.40 × 129,510.72
  4. Step 4: Simplify right side
    225,021.60x = 40,210,281,128.45
  5. Step 5: Solve for x
    x = 40,210,281,128.45/225,021.60
  6. Step 6: Final answer
    x = 178,695.21

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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.