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Finding the Fourth Proportional to 712,653.28, 983,461.78 and 390,368.64

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Solution

The fourth proportional to 712,653.28, 983,461.78 and 390,368.64 is: 538,708.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,653.28 : 983,461.78 = 390,368.64 : x
  2. Step 2: Convert to fraction form
    712,653.28/983,461.78 = 390,368.64/x
  3. Step 3: Cross multiply
    712,653.28x = 983,461.78 × 390,368.64
  4. Step 4: Simplify right side
    712,653.28x = 383,912,637,550.58
  5. Step 5: Solve for x
    x = 383,912,637,550.58/712,653.28
  6. Step 6: Final answer
    x = 538,708.86

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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.