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Finding the Fourth Proportional to 315,686.19, 435,656.49 and 172,455.47

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Solution

The fourth proportional to 315,686.19, 435,656.49 and 172,455.47 is: 237,993.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,686.19 : 435,656.49 = 172,455.47 : x
  2. Step 2: Convert to fraction form
    315,686.19/435,656.49 = 172,455.47/x
  3. Step 3: Cross multiply
    315,686.19x = 435,656.49 × 172,455.47
  4. Step 4: Simplify right side
    315,686.19x = 75,131,342,563.22
  5. Step 5: Solve for x
    x = 75,131,342,563.22/315,686.19
  6. Step 6: Final answer
    x = 237,993.76

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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.