Home / 1,020.30-1,530.45-947.40

Finding the Fourth Proportional to 1,020.30, 1,530.45 and 947.40

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Solution

The fourth proportional to 1,020.30, 1,530.45 and 947.40 is: 1,421.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.30 : 1,530.45 = 947.40 : x
  2. Step 2: Convert to fraction form
    1,020.30/1,530.45 = 947.40/x
  3. Step 3: Cross multiply
    1,020.30x = 1,530.45 × 947.40
  4. Step 4: Simplify right side
    1,020.30x = 1,449,948.33
  5. Step 5: Solve for x
    x = 1,449,948.33/1,020.30
  6. Step 6: Final answer
    x = 1,421.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.