Home / 1,620.03-2,235.56-921.39

Finding the Fourth Proportional to 1,620.03, 2,235.56 and 921.39

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Solution

The fourth proportional to 1,620.03, 2,235.56 and 921.39 is: 1,271.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.03 : 2,235.56 = 921.39 : x
  2. Step 2: Convert to fraction form
    1,620.03/2,235.56 = 921.39/x
  3. Step 3: Cross multiply
    1,620.03x = 2,235.56 × 921.39
  4. Step 4: Simplify right side
    1,620.03x = 2,059,818.02
  5. Step 5: Solve for x
    x = 2,059,818.02/1,620.03
  6. Step 6: Final answer
    x = 1,271.47

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1.5x scale

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.