Home / 1,478.64-2,039.70-918.90

Finding the Fourth Proportional to 1,478.64, 2,039.70 and 918.90

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Solution

The fourth proportional to 1,478.64, 2,039.70 and 918.90 is: 1,267.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.64 : 2,039.70 = 918.90 : x
  2. Step 2: Convert to fraction form
    1,478.64/2,039.70 = 918.90/x
  3. Step 3: Cross multiply
    1,478.64x = 2,039.70 × 918.90
  4. Step 4: Simplify right side
    1,478.64x = 1,874,280.33
  5. Step 5: Solve for x
    x = 1,874,280.33/1,478.64
  6. Step 6: Final answer
    x = 1,267.57

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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.