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Finding the Fourth Proportional to 342,365.16, 513,447.38 and 128,979.12

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Solution

The fourth proportional to 342,365.16, 513,447.38 and 128,979.12 is: 193,430.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,365.16 : 513,447.38 = 128,979.12 : x
  2. Step 2: Convert to fraction form
    342,365.16/513,447.38 = 128,979.12/x
  3. Step 3: Cross multiply
    342,365.16x = 513,447.38 × 128,979.12
  4. Step 4: Simplify right side
    342,365.16x = 66,223,991,238.71
  5. Step 5: Solve for x
    x = 66,223,991,238.71/342,365.16
  6. Step 6: Final answer
    x = 193,430.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.