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Finding the Fourth Proportional to 1,607.86, 2,408 and 783.55

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Solution

The fourth proportional to 1,607.86, 2,408 and 783.55 is: 1,173.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,607.86 : 2,408 = 783.55 : x
  2. Step 2: Convert to fraction form
    1,607.86/2,408 = 783.55/x
  3. Step 3: Cross multiply
    1,607.86x = 2,408 × 783.55
  4. Step 4: Simplify right side
    1,607.86x = 1,886,776.36
  5. Step 5: Solve for x
    x = 1,886,776.36/1,607.86
  6. Step 6: Final answer
    x = 1,173.47

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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.