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Finding the Fourth Proportional to 1,113.51, 1,670.04 and 420.17

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Solution

The fourth proportional to 1,113.51, 1,670.04 and 420.17 is: 630.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.51 : 1,670.04 = 420.17 : x
  2. Step 2: Convert to fraction form
    1,113.51/1,670.04 = 420.17/x
  3. Step 3: Cross multiply
    1,113.51x = 1,670.04 × 420.17
  4. Step 4: Simplify right side
    1,113.51x = 701,692.36
  5. Step 5: Solve for x
    x = 701,692.36/1,113.51
  6. Step 6: Final answer
    x = 630.16

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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.