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Finding the Fourth Proportional to 1,408.79, 2,113.40 and 434.93

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Solution

The fourth proportional to 1,408.79, 2,113.40 and 434.93 is: 652.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.79 : 2,113.40 = 434.93 : x
  2. Step 2: Convert to fraction form
    1,408.79/2,113.40 = 434.93/x
  3. Step 3: Cross multiply
    1,408.79x = 2,113.40 × 434.93
  4. Step 4: Simplify right side
    1,408.79x = 919,171.58
  5. Step 5: Solve for x
    x = 919,171.58/1,408.79
  6. Step 6: Final answer
    x = 652.45

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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.