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Finding the Fourth Proportional to 716,838.75, 989,237.41 and 390,154.10

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Solution

The fourth proportional to 716,838.75, 989,237.41 and 390,154.10 is: 538,412.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,838.75 : 989,237.41 = 390,154.10 : x
  2. Step 2: Convert to fraction form
    716,838.75/989,237.41 = 390,154.10/x
  3. Step 3: Cross multiply
    716,838.75x = 989,237.41 × 390,154.10
  4. Step 4: Simplify right side
    716,838.75x = 385,955,031,384.88
  5. Step 5: Solve for x
    x = 385,955,031,384.88/716,838.75
  6. Step 6: Final answer
    x = 538,412.62

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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.