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Finding the Fourth Proportional to 878,720.28, 1,212,686.28 and 496,782.60

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Solution

The fourth proportional to 878,720.28, 1,212,686.28 and 496,782.60 is: 685,589.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,720.28 : 1,212,686.28 = 496,782.60 : x
  2. Step 2: Convert to fraction form
    878,720.28/1,212,686.28 = 496,782.60/x
  3. Step 3: Cross multiply
    878,720.28x = 1,212,686.28 × 496,782.60
  4. Step 4: Simplify right side
    878,720.28x = 602,441,443,162.73
  5. Step 5: Solve for x
    x = 602,441,443,162.73/878,720.28
  6. Step 6: Final answer
    x = 685,589.55

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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.