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Finding the Fourth Proportional to 1,307.58, 1,959.75 and 648.75

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Solution

The fourth proportional to 1,307.58, 1,959.75 and 648.75 is: 972.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.58 : 1,959.75 = 648.75 : x
  2. Step 2: Convert to fraction form
    1,307.58/1,959.75 = 648.75/x
  3. Step 3: Cross multiply
    1,307.58x = 1,959.75 × 648.75
  4. Step 4: Simplify right side
    1,307.58x = 1,271,387.81
  5. Step 5: Solve for x
    x = 1,271,387.81/1,307.58
  6. Step 6: Final answer
    x = 972.32

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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.