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Finding the Fourth Proportional to 712,838.32, 983,716.86 and 390,560.62

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Solution

The fourth proportional to 712,838.32, 983,716.86 and 390,560.62 is: 538,973.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,838.32 : 983,716.86 = 390,560.62 : x
  2. Step 2: Convert to fraction form
    712,838.32/983,716.86 = 390,560.62/x
  3. Step 3: Cross multiply
    712,838.32x = 983,716.86 × 390,560.62
  4. Step 4: Simplify right side
    712,838.32x = 384,201,066,746.05
  5. Step 5: Solve for x
    x = 384,201,066,746.05/712,838.32
  6. Step 6: Final answer
    x = 538,973.64

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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.