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Finding the Fourth Proportional to 1,030.60, 1,421.39 and 657.46

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Solution

The fourth proportional to 1,030.60, 1,421.39 and 657.46 is: 906.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.60 : 1,421.39 = 657.46 : x
  2. Step 2: Convert to fraction form
    1,030.60/1,421.39 = 657.46/x
  3. Step 3: Cross multiply
    1,030.60x = 1,421.39 × 657.46
  4. Step 4: Simplify right side
    1,030.60x = 934,507.07
  5. Step 5: Solve for x
    x = 934,507.07/1,030.60
  6. Step 6: Final answer
    x = 906.76

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1.5x scale

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.