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Finding the Fourth Proportional to 1,391.18, 2,085.54 and 526.10

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Solution

The fourth proportional to 1,391.18, 2,085.54 and 526.10 is: 788.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.18 : 2,085.54 = 526.10 : x
  2. Step 2: Convert to fraction form
    1,391.18/2,085.54 = 526.10/x
  3. Step 3: Cross multiply
    1,391.18x = 2,085.54 × 526.10
  4. Step 4: Simplify right side
    1,391.18x = 1,097,202.59
  5. Step 5: Solve for x
    x = 1,097,202.59/1,391.18
  6. Step 6: Final answer
    x = 788.68

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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.