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Finding the Fourth Proportional to 287,693.20, 431,539.80 and 100,723.60

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Solution

The fourth proportional to 287,693.20, 431,539.80 and 100,723.60 is: 151,085.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,693.20 : 431,539.80 = 100,723.60 : x
  2. Step 2: Convert to fraction form
    287,693.20/431,539.80 = 100,723.60/x
  3. Step 3: Cross multiply
    287,693.20x = 431,539.80 × 100,723.60
  4. Step 4: Simplify right side
    287,693.20x = 43,466,242,199.28
  5. Step 5: Solve for x
    x = 43,466,242,199.28/287,693.20
  6. Step 6: Final answer
    x = 151,085.40

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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.