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Finding the Fourth Proportional to 712,700.40, 983,526.81 and 390,422.10

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Solution

The fourth proportional to 712,700.40, 983,526.81 and 390,422.10 is: 538,782.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,700.40 : 983,526.81 = 390,422.10 : x
  2. Step 2: Convert to fraction form
    712,700.40/983,526.81 = 390,422.10/x
  3. Step 3: Cross multiply
    712,700.40x = 983,526.81 × 390,422.10
  4. Step 4: Simplify right side
    712,700.40x = 383,990,602,566.50
  5. Step 5: Solve for x
    x = 383,990,602,566.50/712,700.40
  6. Step 6: Final answer
    x = 538,782.64

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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.