Home / 1,317.60-1,817.64-1,123.20

Finding the Fourth Proportional to 1,317.60, 1,817.64 and 1,123.20

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Solution

The fourth proportional to 1,317.60, 1,817.64 and 1,123.20 is: 1,549.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.60 : 1,817.64 = 1,123.20 : x
  2. Step 2: Convert to fraction form
    1,317.60/1,817.64 = 1,123.20/x
  3. Step 3: Cross multiply
    1,317.60x = 1,817.64 × 1,123.20
  4. Step 4: Simplify right side
    1,317.60x = 2,041,573.25
  5. Step 5: Solve for x
    x = 2,041,573.25/1,317.60
  6. Step 6: Final answer
    x = 1,549.46

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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.