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Finding the Fourth Proportional to 660,478.98, 990,406.20 and 255,860.70

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Solution

The fourth proportional to 660,478.98, 990,406.20 and 255,860.70 is: 383,670.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,478.98 : 990,406.20 = 255,860.70 : x
  2. Step 2: Convert to fraction form
    660,478.98/990,406.20 = 255,860.70/x
  3. Step 3: Cross multiply
    660,478.98x = 990,406.20 × 255,860.70
  4. Step 4: Simplify right side
    660,478.98x = 253,406,023,616.34
  5. Step 5: Solve for x
    x = 253,406,023,616.34/660,478.98
  6. Step 6: Final answer
    x = 383,670.08

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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.