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Finding the Fourth Proportional to 1,307.90, 1,959.62 and 648.90

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Solution

The fourth proportional to 1,307.90, 1,959.62 and 648.90 is: 972.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.90 : 1,959.62 = 648.90 : x
  2. Step 2: Convert to fraction form
    1,307.90/1,959.62 = 648.90/x
  3. Step 3: Cross multiply
    1,307.90x = 1,959.62 × 648.90
  4. Step 4: Simplify right side
    1,307.90x = 1,271,597.42
  5. Step 5: Solve for x
    x = 1,271,597.42/1,307.90
  6. Step 6: Final answer
    x = 972.24

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1.5x scale

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.