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Finding the Fourth Proportional to 1,341.28, 2,011.04 and 647.76

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Solution

The fourth proportional to 1,341.28, 2,011.04 and 647.76 is: 971.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,341.28 : 2,011.04 = 647.76 : x
  2. Step 2: Convert to fraction form
    1,341.28/2,011.04 = 647.76/x
  3. Step 3: Cross multiply
    1,341.28x = 2,011.04 × 647.76
  4. Step 4: Simplify right side
    1,341.28x = 1,302,671.27
  5. Step 5: Solve for x
    x = 1,302,671.27/1,341.28
  6. Step 6: Final answer
    x = 971.22

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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.