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Finding the Fourth Proportional to 716.78, 1,075.37 and 278.16

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Solution

The fourth proportional to 716.78, 1,075.37 and 278.16 is: 417.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.78 : 1,075.37 = 278.16 : x
  2. Step 2: Convert to fraction form
    716.78/1,075.37 = 278.16/x
  3. Step 3: Cross multiply
    716.78x = 1,075.37 × 278.16
  4. Step 4: Simplify right side
    716.78x = 299,124.92
  5. Step 5: Solve for x
    x = 299,124.92/716.78
  6. Step 6: Final answer
    x = 417.32

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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.