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Finding the Fourth Proportional to 1,030.05, 1,421.28 and 631.50

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Solution

The fourth proportional to 1,030.05, 1,421.28 and 631.50 is: 871.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.05 : 1,421.28 = 631.50 : x
  2. Step 2: Convert to fraction form
    1,030.05/1,421.28 = 631.50/x
  3. Step 3: Cross multiply
    1,030.05x = 1,421.28 × 631.50
  4. Step 4: Simplify right side
    1,030.05x = 897,538.32
  5. Step 5: Solve for x
    x = 897,538.32/1,030.05
  6. Step 6: Final answer
    x = 871.35

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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.