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Finding the Fourth Proportional to 1,128.02, 1,556.40 and 655.63

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Solution

The fourth proportional to 1,128.02, 1,556.40 and 655.63 is: 904.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.02 : 1,556.40 = 655.63 : x
  2. Step 2: Convert to fraction form
    1,128.02/1,556.40 = 655.63/x
  3. Step 3: Cross multiply
    1,128.02x = 1,556.40 × 655.63
  4. Step 4: Simplify right side
    1,128.02x = 1,020,426.17
  5. Step 5: Solve for x
    x = 1,020,426.17/1,128.02
  6. Step 6: Final answer
    x = 904.62

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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.