Home / 1,209.40-1,667.82-947.32

Finding the Fourth Proportional to 1,209.40, 1,667.82 and 947.32

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Solution

The fourth proportional to 1,209.40, 1,667.82 and 947.32 is: 1,306.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.40 : 1,667.82 = 947.32 : x
  2. Step 2: Convert to fraction form
    1,209.40/1,667.82 = 947.32/x
  3. Step 3: Cross multiply
    1,209.40x = 1,667.82 × 947.32
  4. Step 4: Simplify right side
    1,209.40x = 1,579,959.24
  5. Step 5: Solve for x
    x = 1,579,959.24/1,209.40
  6. Step 6: Final answer
    x = 1,306.40

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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.