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Finding the Fourth Proportional to 1,478.93, 2,219.51 and 657.72

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Solution

The fourth proportional to 1,478.93, 2,219.51 and 657.72 is: 987.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.93 : 2,219.51 = 657.72 : x
  2. Step 2: Convert to fraction form
    1,478.93/2,219.51 = 657.72/x
  3. Step 3: Cross multiply
    1,478.93x = 2,219.51 × 657.72
  4. Step 4: Simplify right side
    1,478.93x = 1,459,817.76
  5. Step 5: Solve for x
    x = 1,459,817.76/1,478.93
  6. Step 6: Final answer
    x = 987.08

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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.