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Finding the Fourth Proportional to 710,422.47, 980,386.61 and 388,138.25

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Solution

The fourth proportional to 710,422.47, 980,386.61 and 388,138.25 is: 535,632.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,422.47 : 980,386.61 = 388,138.25 : x
  2. Step 2: Convert to fraction form
    710,422.47/980,386.61 = 388,138.25/x
  3. Step 3: Cross multiply
    710,422.47x = 980,386.61 × 388,138.25
  4. Step 4: Simplify right side
    710,422.47x = 380,525,543,639.11
  5. Step 5: Solve for x
    x = 380,525,543,639.11/710,422.47
  6. Step 6: Final answer
    x = 535,632.75

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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.