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Finding the Fourth Proportional to 2,855.40, 4,283.40 and 907.15

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Solution

The fourth proportional to 2,855.40, 4,283.40 and 907.15 is: 1,360.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.40 : 4,283.40 = 907.15 : x
  2. Step 2: Convert to fraction form
    2,855.40/4,283.40 = 907.15/x
  3. Step 3: Cross multiply
    2,855.40x = 4,283.40 × 907.15
  4. Step 4: Simplify right side
    2,855.40x = 3,885,686.31
  5. Step 5: Solve for x
    x = 3,885,686.31/2,855.40
  6. Step 6: Final answer
    x = 1,360.82

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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.