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Finding the Fourth Proportional to 1,479.84, 2,220 and 657.96

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Solution

The fourth proportional to 1,479.84, 2,220 and 657.96 is: 987.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.84 : 2,220 = 657.96 : x
  2. Step 2: Convert to fraction form
    1,479.84/2,220 = 657.96/x
  3. Step 3: Cross multiply
    1,479.84x = 2,220 × 657.96
  4. Step 4: Simplify right side
    1,479.84x = 1,460,671.20
  5. Step 5: Solve for x
    x = 1,460,671.20/1,479.84
  6. Step 6: Final answer
    x = 987.05

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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.