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Finding the Fourth Proportional to 1,036.87, 1,555.94 and 420.58

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Solution

The fourth proportional to 1,036.87, 1,555.94 and 420.58 is: 631.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.87 : 1,555.94 = 420.58 : x
  2. Step 2: Convert to fraction form
    1,036.87/1,555.94 = 420.58/x
  3. Step 3: Cross multiply
    1,036.87x = 1,555.94 × 420.58
  4. Step 4: Simplify right side
    1,036.87x = 654,394.41
  5. Step 5: Solve for x
    x = 654,394.41/1,036.87
  6. Step 6: Final answer
    x = 631.13

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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.