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Finding the Fourth Proportional to 659,119.36, 909,264 and 390,657.28

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Solution

The fourth proportional to 659,119.36, 909,264 and 390,657.28 is: 538,916.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,119.36 : 909,264 = 390,657.28 : x
  2. Step 2: Convert to fraction form
    659,119.36/909,264 = 390,657.28/x
  3. Step 3: Cross multiply
    659,119.36x = 909,264 × 390,657.28
  4. Step 4: Simplify right side
    659,119.36x = 355,210,601,041.92
  5. Step 5: Solve for x
    x = 355,210,601,041.92/659,119.36
  6. Step 6: Final answer
    x = 538,916.96

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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.