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Finding the Fourth Proportional to 976.61, 1,347.21 and 578.04

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Solution

The fourth proportional to 976.61, 1,347.21 and 578.04 is: 797.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.61 : 1,347.21 = 578.04 : x
  2. Step 2: Convert to fraction form
    976.61/1,347.21 = 578.04/x
  3. Step 3: Cross multiply
    976.61x = 1,347.21 × 578.04
  4. Step 4: Simplify right side
    976.61x = 778,741.27
  5. Step 5: Solve for x
    x = 778,741.27/976.61
  6. Step 6: Final answer
    x = 797.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.