Home / 1,200.18-1,656.40-869.70

Finding the Fourth Proportional to 1,200.18, 1,656.40 and 869.70

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Solution

The fourth proportional to 1,200.18, 1,656.40 and 869.70 is: 1,200.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.18 : 1,656.40 = 869.70 : x
  2. Step 2: Convert to fraction form
    1,200.18/1,656.40 = 869.70/x
  3. Step 3: Cross multiply
    1,200.18x = 1,656.40 × 869.70
  4. Step 4: Simplify right side
    1,200.18x = 1,440,571.08
  5. Step 5: Solve for x
    x = 1,440,571.08/1,200.18
  6. Step 6: Final answer
    x = 1,200.30

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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.