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Finding the Fourth Proportional to 1,408.81, 2,111.74 and 530.71

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Solution

The fourth proportional to 1,408.81, 2,111.74 and 530.71 is: 795.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.81 : 2,111.74 = 530.71 : x
  2. Step 2: Convert to fraction form
    1,408.81/2,111.74 = 530.71/x
  3. Step 3: Cross multiply
    1,408.81x = 2,111.74 × 530.71
  4. Step 4: Simplify right side
    1,408.81x = 1,120,710.98
  5. Step 5: Solve for x
    x = 1,120,710.98/1,408.81
  6. Step 6: Final answer
    x = 795.50

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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.