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Finding the Fourth Proportional to 315,488.36, 435,042.48 and 207,920.80

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Solution

The fourth proportional to 315,488.36, 435,042.48 and 207,920.80 is: 286,712.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,488.36 : 435,042.48 = 207,920.80 : x
  2. Step 2: Convert to fraction form
    315,488.36/435,042.48 = 207,920.80/x
  3. Step 3: Cross multiply
    315,488.36x = 435,042.48 × 207,920.80
  4. Step 4: Simplify right side
    315,488.36x = 90,454,380,475.58
  5. Step 5: Solve for x
    x = 90,454,380,475.58/315,488.36
  6. Step 6: Final answer
    x = 286,712.26

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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.