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Finding the Fourth Proportional to 1,284.50, 1,925.40 and 918.20

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Solution

The fourth proportional to 1,284.50, 1,925.40 and 918.20 is: 1,376.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.50 : 1,925.40 = 918.20 : x
  2. Step 2: Convert to fraction form
    1,284.50/1,925.40 = 918.20/x
  3. Step 3: Cross multiply
    1,284.50x = 1,925.40 × 918.20
  4. Step 4: Simplify right side
    1,284.50x = 1,767,902.28
  5. Step 5: Solve for x
    x = 1,767,902.28/1,284.50
  6. Step 6: Final answer
    x = 1,376.33

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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.