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Finding the Fourth Proportional to 914.18, 1,258.40 and 692.60

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Solution

The fourth proportional to 914.18, 1,258.40 and 692.60 is: 953.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.18 : 1,258.40 = 692.60 : x
  2. Step 2: Convert to fraction form
    914.18/1,258.40 = 692.60/x
  3. Step 3: Cross multiply
    914.18x = 1,258.40 × 692.60
  4. Step 4: Simplify right side
    914.18x = 871,567.84
  5. Step 5: Solve for x
    x = 871,567.84/914.18
  6. Step 6: Final answer
    x = 953.39

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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.