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Finding the Fourth Proportional to 659,911.20, 989,672.40 and 260,419.20

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Solution

The fourth proportional to 659,911.20, 989,672.40 and 260,419.20 is: 390,552.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,911.20 : 989,672.40 = 260,419.20 : x
  2. Step 2: Convert to fraction form
    659,911.20/989,672.40 = 260,419.20/x
  3. Step 3: Cross multiply
    659,911.20x = 989,672.40 × 260,419.20
  4. Step 4: Simplify right side
    659,911.20x = 257,729,694,670.08
  5. Step 5: Solve for x
    x = 257,729,694,670.08/659,911.20
  6. Step 6: Final answer
    x = 390,552.08

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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.