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Finding the Fourth Proportional to 1,257.40, 1,886.19 and 526.87

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Solution

The fourth proportional to 1,257.40, 1,886.19 and 526.87 is: 790.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.40 : 1,886.19 = 526.87 : x
  2. Step 2: Convert to fraction form
    1,257.40/1,886.19 = 526.87/x
  3. Step 3: Cross multiply
    1,257.40x = 1,886.19 × 526.87
  4. Step 4: Simplify right side
    1,257.40x = 993,776.93
  5. Step 5: Solve for x
    x = 993,776.93/1,257.40
  6. Step 6: Final answer
    x = 790.34

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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.