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Finding the Fourth Proportional to 1,007.08, 1,390.20 and 675.40

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Solution

The fourth proportional to 1,007.08, 1,390.20 and 675.40 is: 932.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.08 : 1,390.20 = 675.40 : x
  2. Step 2: Convert to fraction form
    1,007.08/1,390.20 = 675.40/x
  3. Step 3: Cross multiply
    1,007.08x = 1,390.20 × 675.40
  4. Step 4: Simplify right side
    1,007.08x = 938,941.08
  5. Step 5: Solve for x
    x = 938,941.08/1,007.08
  6. Step 6: Final answer
    x = 932.34

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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.