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Finding the Fourth Proportional to 1,048.17, 1,572.21 and 278.67

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Solution

The fourth proportional to 1,048.17, 1,572.21 and 278.67 is: 417.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.17 : 1,572.21 = 278.67 : x
  2. Step 2: Convert to fraction form
    1,048.17/1,572.21 = 278.67/x
  3. Step 3: Cross multiply
    1,048.17x = 1,572.21 × 278.67
  4. Step 4: Simplify right side
    1,048.17x = 438,127.76
  5. Step 5: Solve for x
    x = 438,127.76/1,048.17
  6. Step 6: Final answer
    x = 417.99

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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.