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Finding the Fourth Proportional to 1,390.23, 2,083.85 and 903.63

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Solution

The fourth proportional to 1,390.23, 2,083.85 and 903.63 is: 1,354.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.23 : 2,083.85 = 903.63 : x
  2. Step 2: Convert to fraction form
    1,390.23/2,083.85 = 903.63/x
  3. Step 3: Cross multiply
    1,390.23x = 2,083.85 × 903.63
  4. Step 4: Simplify right side
    1,390.23x = 1,883,024.86
  5. Step 5: Solve for x
    x = 1,883,024.86/1,390.23
  6. Step 6: Final answer
    x = 1,354.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.