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Finding the Fourth Proportional to 1,038.08, 1,557.08 and 421.60

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Solution

The fourth proportional to 1,038.08, 1,557.08 and 421.60 is: 632.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.08 : 1,557.08 = 421.60 : x
  2. Step 2: Convert to fraction form
    1,038.08/1,557.08 = 421.60/x
  3. Step 3: Cross multiply
    1,038.08x = 1,557.08 × 421.60
  4. Step 4: Simplify right side
    1,038.08x = 656,460.51
  5. Step 5: Solve for x
    x = 656,460.51/1,038.08
  6. Step 6: Final answer
    x = 632.38

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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.