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Finding the Fourth Proportional to 438,307.20, 656,148.60 and 260,722.80

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Solution

The fourth proportional to 438,307.20, 656,148.60 and 260,722.80 is: 390,303.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,307.20 : 656,148.60 = 260,722.80 : x
  2. Step 2: Convert to fraction form
    438,307.20/656,148.60 = 260,722.80/x
  3. Step 3: Cross multiply
    438,307.20x = 656,148.60 × 260,722.80
  4. Step 4: Simplify right side
    438,307.20x = 171,072,900,208.08
  5. Step 5: Solve for x
    x = 171,072,900,208.08/438,307.20
  6. Step 6: Final answer
    x = 390,303.65

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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.