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Finding the Fourth Proportional to 914.70, 1,261.80 and 693.28

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Solution

The fourth proportional to 914.70, 1,261.80 and 693.28 is: 956.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.70 : 1,261.80 = 693.28 : x
  2. Step 2: Convert to fraction form
    914.70/1,261.80 = 693.28/x
  3. Step 3: Cross multiply
    914.70x = 1,261.80 × 693.28
  4. Step 4: Simplify right side
    914.70x = 874,777.55
  5. Step 5: Solve for x
    x = 874,777.55/914.70
  6. Step 6: Final answer
    x = 956.35

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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.