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Finding the Fourth Proportional to 1,207.40, 1,810.72 and 477.20

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Solution

The fourth proportional to 1,207.40, 1,810.72 and 477.20 is: 715.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.40 : 1,810.72 = 477.20 : x
  2. Step 2: Convert to fraction form
    1,207.40/1,810.72 = 477.20/x
  3. Step 3: Cross multiply
    1,207.40x = 1,810.72 × 477.20
  4. Step 4: Simplify right side
    1,207.40x = 864,075.58
  5. Step 5: Solve for x
    x = 864,075.58/1,207.40
  6. Step 6: Final answer
    x = 715.65

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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.