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Finding the Fourth Proportional to 287,561.20, 431,341.80 and 77,220.40

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Solution

The fourth proportional to 287,561.20, 431,341.80 and 77,220.40 is: 115,830.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,561.20 : 431,341.80 = 77,220.40 : x
  2. Step 2: Convert to fraction form
    287,561.20/431,341.80 = 77,220.40/x
  3. Step 3: Cross multiply
    287,561.20x = 431,341.80 × 77,220.40
  4. Step 4: Simplify right side
    287,561.20x = 33,308,386,332.72
  5. Step 5: Solve for x
    x = 33,308,386,332.72/287,561.20
  6. Step 6: Final answer
    x = 115,830.60

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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.