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Finding the Fourth Proportional to 621,415.36, 931,476.66 and 421,751.98

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Solution

The fourth proportional to 621,415.36, 931,476.66 and 421,751.98 is: 632,189.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,415.36 : 931,476.66 = 421,751.98 : x
  2. Step 2: Convert to fraction form
    621,415.36/931,476.66 = 421,751.98/x
  3. Step 3: Cross multiply
    621,415.36x = 931,476.66 × 421,751.98
  4. Step 4: Simplify right side
    621,415.36x = 392,852,125,678.79
  5. Step 5: Solve for x
    x = 392,852,125,678.79/621,415.36
  6. Step 6: Final answer
    x = 632,189.27

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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.