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Finding the Fourth Proportional to 611,316.10, 915,681.39 and 386,560.54

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Solution

The fourth proportional to 611,316.10, 915,681.39 and 386,560.54 is: 579,023.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,316.10 : 915,681.39 = 386,560.54 : x
  2. Step 2: Convert to fraction form
    611,316.10/915,681.39 = 386,560.54/x
  3. Step 3: Cross multiply
    611,316.10x = 915,681.39 × 386,560.54
  4. Step 4: Simplify right side
    611,316.10x = 353,966,292,586.35
  5. Step 5: Solve for x
    x = 353,966,292,586.35/611,316.10
  6. Step 6: Final answer
    x = 579,023.34

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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.