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Finding the Fourth Proportional to 1,038.74, 1,557.30 and 518.95

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Solution

The fourth proportional to 1,038.74, 1,557.30 and 518.95 is: 778.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.74 : 1,557.30 = 518.95 : x
  2. Step 2: Convert to fraction form
    1,038.74/1,557.30 = 518.95/x
  3. Step 3: Cross multiply
    1,038.74x = 1,557.30 × 518.95
  4. Step 4: Simplify right side
    1,038.74x = 808,153.05
  5. Step 5: Solve for x
    x = 808,153.05/1,038.74
  6. Step 6: Final answer
    x = 778.01

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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.