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Finding the Fourth Proportional to 1,237.79, 1,856.70 and 579.30

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Solution

The fourth proportional to 1,237.79, 1,856.70 and 579.30 is: 868.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.79 : 1,856.70 = 579.30 : x
  2. Step 2: Convert to fraction form
    1,237.79/1,856.70 = 579.30/x
  3. Step 3: Cross multiply
    1,237.79x = 1,856.70 × 579.30
  4. Step 4: Simplify right side
    1,237.79x = 1,075,586.31
  5. Step 5: Solve for x
    x = 1,075,586.31/1,237.79
  6. Step 6: Final answer
    x = 868.96

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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.