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Finding the Fourth Proportional to 312,544.80, 431,312.88 and 169,304.40

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Solution

The fourth proportional to 312,544.80, 431,312.88 and 169,304.40 is: 233,640.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,544.80 : 431,312.88 = 169,304.40 : x
  2. Step 2: Convert to fraction form
    312,544.80/431,312.88 = 169,304.40/x
  3. Step 3: Cross multiply
    312,544.80x = 431,312.88 × 169,304.40
  4. Step 4: Simplify right side
    312,544.80x = 73,023,168,360.67
  5. Step 5: Solve for x
    x = 73,023,168,360.67/312,544.80
  6. Step 6: Final answer
    x = 233,640.64

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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.