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Finding the Fourth Proportional to 816.93, 1,127.67 and 485.52

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Solution

The fourth proportional to 816.93, 1,127.67 and 485.52 is: 670.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.93 : 1,127.67 = 485.52 : x
  2. Step 2: Convert to fraction form
    816.93/1,127.67 = 485.52/x
  3. Step 3: Cross multiply
    816.93x = 1,127.67 × 485.52
  4. Step 4: Simplify right side
    816.93x = 547,506.34
  5. Step 5: Solve for x
    x = 547,506.34/816.93
  6. Step 6: Final answer
    x = 670.20

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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.