Home / 1,312.50-1,968.36-618.78

Finding the Fourth Proportional to 1,312.50, 1,968.36 and 618.78

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Solution

The fourth proportional to 1,312.50, 1,968.36 and 618.78 is: 927.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.50 : 1,968.36 = 618.78 : x
  2. Step 2: Convert to fraction form
    1,312.50/1,968.36 = 618.78/x
  3. Step 3: Cross multiply
    1,312.50x = 1,968.36 × 618.78
  4. Step 4: Simplify right side
    1,312.50x = 1,217,981.80
  5. Step 5: Solve for x
    x = 1,217,981.80/1,312.50
  6. Step 6: Final answer
    x = 927.99

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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.