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Finding the Fourth Proportional to 971.81, 1,341.32 and 578.76

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Solution

The fourth proportional to 971.81, 1,341.32 and 578.76 is: 798.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.81 : 1,341.32 = 578.76 : x
  2. Step 2: Convert to fraction form
    971.81/1,341.32 = 578.76/x
  3. Step 3: Cross multiply
    971.81x = 1,341.32 × 578.76
  4. Step 4: Simplify right side
    971.81x = 776,302.36
  5. Step 5: Solve for x
    x = 776,302.36/971.81
  6. Step 6: Final answer
    x = 798.82

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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.