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Finding the Fourth Proportional to 317,326.60, 475,989.90 and 139,742.20

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Solution

The fourth proportional to 317,326.60, 475,989.90 and 139,742.20 is: 209,613.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,326.60 : 475,989.90 = 139,742.20 : x
  2. Step 2: Convert to fraction form
    317,326.60/475,989.90 = 139,742.20/x
  3. Step 3: Cross multiply
    317,326.60x = 475,989.90 × 139,742.20
  4. Step 4: Simplify right side
    317,326.60x = 66,515,875,803.78
  5. Step 5: Solve for x
    x = 66,515,875,803.78/317,326.60
  6. Step 6: Final answer
    x = 209,613.30

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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.