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Finding the Fourth Proportional to 545.70, 753.08 and 309.70

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Solution

The fourth proportional to 545.70, 753.08 and 309.70 is: 427.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.70 : 753.08 = 309.70 : x
  2. Step 2: Convert to fraction form
    545.70/753.08 = 309.70/x
  3. Step 3: Cross multiply
    545.70x = 753.08 × 309.70
  4. Step 4: Simplify right side
    545.70x = 233,228.88
  5. Step 5: Solve for x
    x = 233,228.88/545.70
  6. Step 6: Final answer
    x = 427.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.