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Finding the Fourth Proportional to 1,256.90, 1,885.90 and 526.64

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Solution

The fourth proportional to 1,256.90, 1,885.90 and 526.64 is: 790.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.90 : 1,885.90 = 526.64 : x
  2. Step 2: Convert to fraction form
    1,256.90/1,885.90 = 526.64/x
  3. Step 3: Cross multiply
    1,256.90x = 1,885.90 × 526.64
  4. Step 4: Simplify right side
    1,256.90x = 993,190.38
  5. Step 5: Solve for x
    x = 993,190.38/1,256.90
  6. Step 6: Final answer
    x = 790.19

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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.