Home / 1,312.12-1,968.27-618.40

Finding the Fourth Proportional to 1,312.12, 1,968.27 and 618.40

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Solution

The fourth proportional to 1,312.12, 1,968.27 and 618.40 is: 927.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.12 : 1,968.27 = 618.40 : x
  2. Step 2: Convert to fraction form
    1,312.12/1,968.27 = 618.40/x
  3. Step 3: Cross multiply
    1,312.12x = 1,968.27 × 618.40
  4. Step 4: Simplify right side
    1,312.12x = 1,217,178.17
  5. Step 5: Solve for x
    x = 1,217,178.17/1,312.12
  6. Step 6: Final answer
    x = 927.64

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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.