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Finding the Fourth Proportional to 1,880.24, 2,820.36 and 647.66

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Solution

The fourth proportional to 1,880.24, 2,820.36 and 647.66 is: 971.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,880.24 : 2,820.36 = 647.66 : x
  2. Step 2: Convert to fraction form
    1,880.24/2,820.36 = 647.66/x
  3. Step 3: Cross multiply
    1,880.24x = 2,820.36 × 647.66
  4. Step 4: Simplify right side
    1,880.24x = 1,826,634.36
  5. Step 5: Solve for x
    x = 1,826,634.36/1,880.24
  6. Step 6: Final answer
    x = 971.49

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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.