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Finding the Fourth Proportional to 1,278.84, 1,762.47 and 928.92

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Solution

The fourth proportional to 1,278.84, 1,762.47 and 928.92 is: 1,280.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.84 : 1,762.47 = 928.92 : x
  2. Step 2: Convert to fraction form
    1,278.84/1,762.47 = 928.92/x
  3. Step 3: Cross multiply
    1,278.84x = 1,762.47 × 928.92
  4. Step 4: Simplify right side
    1,278.84x = 1,637,193.63
  5. Step 5: Solve for x
    x = 1,637,193.63/1,278.84
  6. Step 6: Final answer
    x = 1,280.22

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1.5x scale

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.