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Finding the Fourth Proportional to 1,036.49, 1,555.23 and 420.20

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Solution

The fourth proportional to 1,036.49, 1,555.23 and 420.20 is: 630.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.49 : 1,555.23 = 420.20 : x
  2. Step 2: Convert to fraction form
    1,036.49/1,555.23 = 420.20/x
  3. Step 3: Cross multiply
    1,036.49x = 1,555.23 × 420.20
  4. Step 4: Simplify right side
    1,036.49x = 653,507.65
  5. Step 5: Solve for x
    x = 653,507.65/1,036.49
  6. Step 6: Final answer
    x = 630.50

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Double scale
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1.5x scale

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.