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Finding the Fourth Proportional to 712,606.68, 983,362.14 and 390,318.21

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Solution

The fourth proportional to 712,606.68, 983,362.14 and 390,318.21 is: 538,619.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,606.68 : 983,362.14 = 390,318.21 : x
  2. Step 2: Convert to fraction form
    712,606.68/983,362.14 = 390,318.21/x
  3. Step 3: Cross multiply
    712,606.68x = 983,362.14 × 390,318.21
  4. Step 4: Simplify right side
    712,606.68x = 383,824,150,266.57
  5. Step 5: Solve for x
    x = 383,824,150,266.57/712,606.68
  6. Step 6: Final answer
    x = 538,619.92

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Double scale
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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.