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Finding the Fourth Proportional to 1,036.35, 1,430.03 and 638.22

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Solution

The fourth proportional to 1,036.35, 1,430.03 and 638.22 is: 880.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.35 : 1,430.03 = 638.22 : x
  2. Step 2: Convert to fraction form
    1,036.35/1,430.03 = 638.22/x
  3. Step 3: Cross multiply
    1,036.35x = 1,430.03 × 638.22
  4. Step 4: Simplify right side
    1,036.35x = 912,680.70
  5. Step 5: Solve for x
    x = 912,680.70/1,036.35
  6. Step 6: Final answer
    x = 880.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.