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Finding the Fourth Proportional to 402,595.70, 555,588.98 and 221,315.28

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Solution

The fourth proportional to 402,595.70, 555,588.98 and 221,315.28 is: 305,418.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,595.70 : 555,588.98 = 221,315.28 : x
  2. Step 2: Convert to fraction form
    402,595.70/555,588.98 = 221,315.28/x
  3. Step 3: Cross multiply
    402,595.70x = 555,588.98 × 221,315.28
  4. Step 4: Simplify right side
    402,595.70x = 122,960,330,673.61
  5. Step 5: Solve for x
    x = 122,960,330,673.61/402,595.70
  6. Step 6: Final answer
    x = 305,418.89

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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.