Home / 1,223.19-1,688.13-927.90

Finding the Fourth Proportional to 1,223.19, 1,688.13 and 927.90

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Solution

The fourth proportional to 1,223.19, 1,688.13 and 927.90 is: 1,280.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.19 : 1,688.13 = 927.90 : x
  2. Step 2: Convert to fraction form
    1,223.19/1,688.13 = 927.90/x
  3. Step 3: Cross multiply
    1,223.19x = 1,688.13 × 927.90
  4. Step 4: Simplify right side
    1,223.19x = 1,566,415.83
  5. Step 5: Solve for x
    x = 1,566,415.83/1,223.19
  6. Step 6: Final answer
    x = 1,280.60

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Double scale
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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.