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Finding the Fourth Proportional to 639,475.20, 957,369.60 and 390,643.20

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Solution

The fourth proportional to 639,475.20, 957,369.60 and 390,643.20 is: 584,838.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,475.20 : 957,369.60 = 390,643.20 : x
  2. Step 2: Convert to fraction form
    639,475.20/957,369.60 = 390,643.20/x
  3. Step 3: Cross multiply
    639,475.20x = 957,369.60 × 390,643.20
  4. Step 4: Simplify right side
    639,475.20x = 373,989,924,126.72
  5. Step 5: Solve for x
    x = 373,989,924,126.72/639,475.20
  6. Step 6: Final answer
    x = 584,838.82

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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.