Home / 129,574.16-178,809.64-72,218.72

Finding the Fourth Proportional to 129,574.16, 178,809.64 and 72,218.72

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Solution

The fourth proportional to 129,574.16, 178,809.64 and 72,218.72 is: 99,660.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,574.16 : 178,809.64 = 72,218.72 : x
  2. Step 2: Convert to fraction form
    129,574.16/178,809.64 = 72,218.72/x
  3. Step 3: Cross multiply
    129,574.16x = 178,809.64 × 72,218.72
  4. Step 4: Simplify right side
    129,574.16x = 12,913,402,430.41
  5. Step 5: Solve for x
    x = 12,913,402,430.41/129,574.16
  6. Step 6: Final answer
    x = 99,660.33

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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.