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Finding the Fourth Proportional to 716,809.30, 989,196.90 and 390,123.52

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Solution

The fourth proportional to 716,809.30, 989,196.90 and 390,123.52 is: 538,370.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,809.30 : 989,196.90 = 390,123.52 : x
  2. Step 2: Convert to fraction form
    716,809.30/989,196.90 = 390,123.52/x
  3. Step 3: Cross multiply
    716,809.30x = 989,196.90 × 390,123.52
  4. Step 4: Simplify right side
    716,809.30x = 385,908,976,601.09
  5. Step 5: Solve for x
    x = 385,908,976,601.09/716,809.30
  6. Step 6: Final answer
    x = 538,370.49

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1.5x scale

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.