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Finding the Fourth Proportional to 1,258.68, 1,888.34 and 478.69

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Solution

The fourth proportional to 1,258.68, 1,888.34 and 478.69 is: 718.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.68 : 1,888.34 = 478.69 : x
  2. Step 2: Convert to fraction form
    1,258.68/1,888.34 = 478.69/x
  3. Step 3: Cross multiply
    1,258.68x = 1,888.34 × 478.69
  4. Step 4: Simplify right side
    1,258.68x = 903,927.08
  5. Step 5: Solve for x
    x = 903,927.08/1,258.68
  6. Step 6: Final answer
    x = 718.16

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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.