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Finding the Fourth Proportional to 1,030.98, 1,421.80 and 912.52

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Solution

The fourth proportional to 1,030.98, 1,421.80 and 912.52 is: 1,258.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.98 : 1,421.80 = 912.52 : x
  2. Step 2: Convert to fraction form
    1,030.98/1,421.80 = 912.52/x
  3. Step 3: Cross multiply
    1,030.98x = 1,421.80 × 912.52
  4. Step 4: Simplify right side
    1,030.98x = 1,297,413.83
  5. Step 5: Solve for x
    x = 1,297,413.83/1,030.98
  6. Step 6: Final answer
    x = 1,258.43

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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.