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Finding the Fourth Proportional to 716,969.59, 989,430.62 and 390,292

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Solution

The fourth proportional to 716,969.59, 989,430.62 and 390,292 is: 538,609.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,969.59 : 989,430.62 = 390,292 : x
  2. Step 2: Convert to fraction form
    716,969.59/989,430.62 = 390,292/x
  3. Step 3: Cross multiply
    716,969.59x = 989,430.62 × 390,292
  4. Step 4: Simplify right side
    716,969.59x = 386,166,855,541.04
  5. Step 5: Solve for x
    x = 386,166,855,541.04/716,969.59
  6. Step 6: Final answer
    x = 538,609.81

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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.