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Finding the Fourth Proportional to 315,688.15, 435,633.40 and 172,420.52

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Solution

The fourth proportional to 315,688.15, 435,633.40 and 172,420.52 is: 237,931.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,688.15 : 435,633.40 = 172,420.52 : x
  2. Step 2: Convert to fraction form
    315,688.15/435,633.40 = 172,420.52/x
  3. Step 3: Cross multiply
    315,688.15x = 435,633.40 × 172,420.52
  4. Step 4: Simplify right side
    315,688.15x = 75,112,135,394.73
  5. Step 5: Solve for x
    x = 75,112,135,394.73/315,688.15
  6. Step 6: Final answer
    x = 237,931.44

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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.