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Finding the Fourth Proportional to 659,715.20, 989,378.40 and 260,223.20

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Solution

The fourth proportional to 659,715.20, 989,378.40 and 260,223.20 is: 390,258.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,715.20 : 989,378.40 = 260,223.20 : x
  2. Step 2: Convert to fraction form
    659,715.20/989,378.40 = 260,223.20/x
  3. Step 3: Cross multiply
    659,715.20x = 989,378.40 × 260,223.20
  4. Step 4: Simplify right side
    659,715.20x = 257,459,213,258.88
  5. Step 5: Solve for x
    x = 257,459,213,258.88/659,715.20
  6. Step 6: Final answer
    x = 390,258.12

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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.