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Finding the Fourth Proportional to 591,434.79, 815,330.19 and 421,373.67

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Solution

The fourth proportional to 591,434.79, 815,330.19 and 421,373.67 is: 580,890.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    591,434.79 : 815,330.19 = 421,373.67 : x
  2. Step 2: Convert to fraction form
    591,434.79/815,330.19 = 421,373.67/x
  3. Step 3: Cross multiply
    591,434.79x = 815,330.19 × 421,373.67
  4. Step 4: Simplify right side
    591,434.79x = 343,558,674,422.10
  5. Step 5: Solve for x
    x = 343,558,674,422.10/591,434.79
  6. Step 6: Final answer
    x = 580,890.20

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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.