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Finding the Fourth Proportional to 315,449.32, 435,320.76 and 172,209.40

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Solution

The fourth proportional to 315,449.32, 435,320.76 and 172,209.40 is: 237,649.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,449.32 : 435,320.76 = 172,209.40 : x
  2. Step 2: Convert to fraction form
    315,449.32/435,320.76 = 172,209.40/x
  3. Step 3: Cross multiply
    315,449.32x = 435,320.76 × 172,209.40
  4. Step 4: Simplify right side
    315,449.32x = 74,966,326,887.14
  5. Step 5: Solve for x
    x = 74,966,326,887.14/315,449.32
  6. Step 6: Final answer
    x = 237,649.35

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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.