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Finding the Fourth Proportional to 716,970.59, 989,432 and 390,293

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Solution

The fourth proportional to 716,970.59, 989,432 and 390,293 is: 538,611.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,970.59 : 989,432 = 390,293 : x
  2. Step 2: Convert to fraction form
    716,970.59/989,432 = 390,293/x
  3. Step 3: Cross multiply
    716,970.59x = 989,432 × 390,293
  4. Step 4: Simplify right side
    716,970.59x = 386,168,383,576
  5. Step 5: Solve for x
    x = 386,168,383,576/716,970.59
  6. Step 6: Final answer
    x = 538,611.19

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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.