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Finding the Fourth Proportional to 661,119,459.80, 991,679,189.70 and 620,808,675.80

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Solution

The fourth proportional to 661,119,459.80, 991,679,189.70 and 620,808,675.80 is: 931,213,013.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,119,459.80 : 991,679,189.70 = 620,808,675.80 : x
  2. Step 2: Convert to fraction form
    661,119,459.80/991,679,189.70 = 620,808,675.80/x
  3. Step 3: Cross multiply
    661,119,459.80x = 991,679,189.70 × 620,808,675.80
  4. Step 4: Simplify right side
    661,119,459.80x = 615,643,044,576,073,984
  5. Step 5: Solve for x
    x = 615,643,044,576,073,984/661,119,459.80
  6. Step 6: Final answer
    x = 931,213,013.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.