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Finding the Fourth Proportional to 975.84, 1,346.28 and 644.46

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Solution

The fourth proportional to 975.84, 1,346.28 and 644.46 is: 889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.84 : 1,346.28 = 644.46 : x
  2. Step 2: Convert to fraction form
    975.84/1,346.28 = 644.46/x
  3. Step 3: Cross multiply
    975.84x = 1,346.28 × 644.46
  4. Step 4: Simplify right side
    975.84x = 867,623.61
  5. Step 5: Solve for x
    x = 867,623.61/975.84
  6. Step 6: Final answer
    x = 889.10

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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.