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Finding the Fourth Proportional to 715,454.96, 987,112.56 and 428,870.48

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Solution

The fourth proportional to 715,454.96, 987,112.56 and 428,870.48 is: 591,712.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,454.96 : 987,112.56 = 428,870.48 : x
  2. Step 2: Convert to fraction form
    715,454.96/987,112.56 = 428,870.48/x
  3. Step 3: Cross multiply
    715,454.96x = 987,112.56 × 428,870.48
  4. Step 4: Simplify right side
    715,454.96x = 423,343,437,421.23
  5. Step 5: Solve for x
    x = 423,343,437,421.23/715,454.96
  6. Step 6: Final answer
    x = 591,712.21

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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.