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Finding the Fourth Proportional to 661,699.53, 912,897.95 and 389,601.09

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Solution

The fourth proportional to 661,699.53, 912,897.95 and 389,601.09 is: 537,503.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,699.53 : 912,897.95 = 389,601.09 : x
  2. Step 2: Convert to fraction form
    661,699.53/912,897.95 = 389,601.09/x
  3. Step 3: Cross multiply
    661,699.53x = 912,897.95 × 389,601.09
  4. Step 4: Simplify right side
    661,699.53x = 355,666,034,430.76
  5. Step 5: Solve for x
    x = 355,666,034,430.76/661,699.53
  6. Step 6: Final answer
    x = 537,503.83

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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.