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Finding the Fourth Proportional to 1,030.81, 1,555.19 and 979.58

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Solution

The fourth proportional to 1,030.81, 1,555.19 and 979.58 is: 1,477.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.81 : 1,555.19 = 979.58 : x
  2. Step 2: Convert to fraction form
    1,030.81/1,555.19 = 979.58/x
  3. Step 3: Cross multiply
    1,030.81x = 1,555.19 × 979.58
  4. Step 4: Simplify right side
    1,030.81x = 1,523,433.02
  5. Step 5: Solve for x
    x = 1,523,433.02/1,030.81
  6. Step 6: Final answer
    x = 1,477.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.