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Finding the Fourth Proportional to 688.58, 1,030.46 and 648.60

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Solution

The fourth proportional to 688.58, 1,030.46 and 648.60 is: 970.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.58 : 1,030.46 = 648.60 : x
  2. Step 2: Convert to fraction form
    688.58/1,030.46 = 648.60/x
  3. Step 3: Cross multiply
    688.58x = 1,030.46 × 648.60
  4. Step 4: Simplify right side
    688.58x = 668,356.36
  5. Step 5: Solve for x
    x = 668,356.36/688.58
  6. Step 6: Final answer
    x = 970.63

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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.