Home / 1,117.02-1,675.14-386.40

Finding the Fourth Proportional to 1,117.02, 1,675.14 and 386.40

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Solution

The fourth proportional to 1,117.02, 1,675.14 and 386.40 is: 579.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.02 : 1,675.14 = 386.40 : x
  2. Step 2: Convert to fraction form
    1,117.02/1,675.14 = 386.40/x
  3. Step 3: Cross multiply
    1,117.02x = 1,675.14 × 386.40
  4. Step 4: Simplify right side
    1,117.02x = 647,274.10
  5. Step 5: Solve for x
    x = 647,274.10/1,117.02
  6. Step 6: Final answer
    x = 579.47

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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.